Electronics > Beginners
DC bias in transformer
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Simon:
There are regulations now. sub 1kW stuff you may get away with but everything is becoming power factor corrected to improve infrastucture and power usage. It's not a conspiracy. If your power factor is 0.5 for every 1W you use they have to generate 2W, you will appear to use 2W but then shove 1W back to them when they don't want it. Why should you only pay for what you use when your equipment is so badly designed that it requires more power to be generated than used.
Zero999:
They actually don't have to generate double the power to power loads with a power factor of 0.5. It just results in double the transmission losses.
AVGresponding:
My apologies; since your flag indicates you're British, I thought you'd understand sarcasm and satire...

And let's look at your argument from a different angle:
Why should I pay for badly designed consumer goods that have piss-poor power factors?
Answer: Because I have no choice, I have to buy what they will sell (or buy nothing and go completely without).

LED lamps are a good example.
We were told to buy compact fluorescents instead of incandescents, to save power and the environment, then LEDs instead of compact fluorescents.
Each step along this road has brought us poorer power factors. It should also have brought us greater lamp life; the manufacturers are wise to that one, they have introduced lower and lower quality standards to offset the natural longevity of the newer technologies.
They have also introduced more waste, as now it's harder to replace just a lamp; now it's far more common to have to replace an entire luminaire.

Ehhh... thanks to my own arguments, I now have to withdraw the 'sarcasm' comment; it's a real conspiracy after all...


EDIT: My PS4 has a pf of 0.61-0.68 when running, settling at 0.64 on menu screen. Pretty damn crappy for such an expensive and pervasive piece of consumer electronics.
dom0:

--- Quote from: Electrocow on October 11, 2019, 02:06:37 pm ---This is not something mortal people encounter during our day-to-day activities, but this issue is highly prevalent among audio-engineering aficionados. A common solution is to put two huge electrolytic capacitors in series with the mains in the power supply for example an audio amplifier.

--- End quote ---

You can increase tolerance to DC currents of a transformer by reducing the flux density in the core.
Simon:
there has always been a conspiracy, it's called the majority of consumers want dirt cheap goods and the majority of manufacturers don't care how they make their money. Thats why we have to have standards.
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